biological_transitions - 1 P U B E R T Y : A N O V E R V I...

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Unformatted text preview: 1 P U B E R T Y : A N O V E R V I E W ! Puberty Puberty period of rapid physical maturation involving hormonal and bodily changes that take place primarily in early adolescence. " NOT NOT an event but a process; involves many dimensions ! Five chief manifestations of puberty: Five chief manifestations of puberty: " A rapid acceleration in growth " The development of primary sex characteristics " The development of secondary sex characteristics " Changes in body composition " Changes in the circulatory and respiratory systems ! The Endocrine System The Endocrine System No new hormones are produced and no new bodily systems develop at puberty A feedback loop develops involving the pituitary gland, the hypothalamus, and the gonads D e f i n i t i o n o f T e r m s ! Glands Glands organs that stimulate particular parts of the body to respond in specific ways ! Hormones Hormones powerful substances secreted by the endrocrine glands and carried through the body by the bloodstream " Androgens Androgens main class of male sex hormones ! Testosterone # important role in male pubertal development # development of external genitals, increase in height, and voice changes " Estrogens Estrogens main class of female sex hormones ! Estradiol # important role in female pubertal development # breast development, uterine development, and skeletal changes ! How does the endrocrine system function to maintain appropriate levels of sex hormones? 2 E n dr o c i n e S y s t e m Set point Set point # a physiological level or setting (of a specific hormone, for example) that the body attempts to maintain through a self-regulating system Feedback loop Feedback loop # a cycle through which two or more bodily functions respond to and regulate each other HPG Axis HPG Axis # the neuropsychological pathway that involves the hypothalamus, pituitary gland, and gonads W h a t T r i gge r s Pube r t y ? W h a t T r i gge r s Pube r t y ? ! Adrenarche and Gonadarche Adrenarche and Gonadarche " Puberty two phases that are linked to puberty: ! Adrenarche # involves hormonal changes in the adrenal glands just above the kidneys " Occurs early (about 6-9 years) ! Gonadarche # follow adrenarche by about 2 years " Involves sexual maturation & development of reproductive maturity " Begins 9-10 in non-Latino white girls; 8-9 # African American Girls " 10-11 # boys " Culmination of Gonadarche ? $ Menarche in girls; spermarche in boys ! Weight, Body Fat, and Leptin Weight, Body Fat, and Leptin " Increasing evidence that rising levels of a protein produced by fat cells, leptin, may be the most important signal (Spear, 2000). ! Rising levels of leptins # instructs hypothalamus both to stop doing things that inhibit puberty and start doing things that set it into motion " Thyroid and adrenal cortex secrete hormones # somatic (physical) changes 3 S O M A T I C D E V E L O P M E N T ! Changes in Stature and the Dimensions of the Body Changes in Stature and the Dimensions of the Body...
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biological_transitions - 1 P U B E R T Y : A N O V E R V I...

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